Tire.



I. B. KEMPSHALL.

TIRE.

APPLICATION PI'LBDAPR. 2, 1910.

f Patented Maya, 1910.

" l and I do' hereby declare the following to be oNrrrfn sinL f rn', orario.

Inn BELLE KEMPSHALL, or BOSTON, MASSACHUSETTS, nssmnon 'roo mar-ars COMPANY, A CORPORATION or MAINE.

' TIRE.

Specification of Letters :Patentv Original application filed 'March 21, 1910, Serial No. 550,562. Divided and this application tiled April To all whom it may concern;

sHALma citizen of theA United States, residing at'Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Tires;

a full, clear, and exact description Vof the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had .to

of reference marked thereon,

'part of this specification.

to so dispose or breaking on the ,requiredresiliency Furthermore,

the laccompanying drawings, and to figures This invention relates -to improvements in vehicle tires, and forms a division of vmy application for Patent No. 550,562.' filed March 21, 1910.

The invention relates more particularly to the shoe or tread portion, the object being a series of'project'ions or ribs, with reference to a plurality of pockets or compression chambers in the face of..the tread, thatthe effective action of the said chambers will not be interfered with by the projections. l

ItV is essential in'tires having compression chambers in the tread, to permit the material of the tire surrounding such chambers to readily yield to allow the suction action to freely take place, and yet it 'is equally essential that the-thickened tread vsurface be reinforced Vto prevent the tire cracking the line where it fieXes when load pressure is ap lied. This contingency must be met accor ing to the weight, and size of the tire and the use to which the latter is to be put. For light and medium weight tires, I have found that if the projections are alternately disposed on opposite sides of a tire and each rojection is alternatel disposed with re erence toy a compresslon chamber the suction action of the said chambers will be effective, and the in.

termediate portion of the tread surface between the compression 'chambers vwill be ade uately braced to' prevent the tread crac ing. and breaking andlyet permit of to render the'p'rojections more elfective -when the yloadfstram 1s applied to the tire the outer ends ofthe proj ections terminate with and their'. surfaces are level with the tread which form a.

' edges 1910. Serial No. 553,121', y

surface, of the tire. the pressureis in direct line with the pro- Patented May v3, initd..

By 'this construction jections, and thereby relieves the strain 0I) the surface between such projections.`

The invention also relates to thel specific I details of construction and arrangement ofparts tobe-hereinafter described, and. particularly pointed out in the claims.

Figure 1 'is `a plan view- In the drawing:

of my improved tire. Fig. 2 is a side elevation of the same.` on the line 3-3 -of Fig. l.

in all the figures.

In the preferred form thereof shown herein, the shoe when the tire is of pneumatic form, or the wear member t ereof when the tire is of solidform, may be made of any preferred construction, the surface of which,

-however, is usually composed of rubber. In

the present instance this wear member o'r shoe 2 is shown provided with a tread 2' the tread 'surface 3 lof which is slightly curved in'cross section, although it may be entirely flat if preferred. This tread surface is somewhat thickened asl compared with the sides of the tire, such tire tapering in thickness away the tread and from 5 formed for then purpose of attaching the shoe to the rim or felly. In the present instance this wear member or shoe 2 is provided along periphery with a serles of openings o1'- chambers 6, preferably of circular formation and' forming suction orA compression pockets. around the entire These openings extend surface of the tire and, as stated, lform compression-chambers e'ective to grip the road` v surface and preventskidding.

The sides of the tire are reinforced b the provision of ribs or projections 7 whic in the present instance terminate at the tread the sides i of toward the beaded or flanged `its tread surface or Fig. 3 is a cross sect-ion The lsame numerals refer to like parts surface or periphery ofthe tire, and as shown herein the ends thereof are slightly fiat these ribs may also terminatev inbeveled or rounded and are levelwith the thev uttresses conform-tothe tread surface of the shoe and terminate at such tread surface, so that when the t1re is under load the outer ends of the projections, as Well as the tread surface, will be'brought into engage- 'ment with the'roadway, so that the projections will receive a portion of the load'of f the tire and thus reinforce the tapering side be readily understood. These projections taper off toward .their inner ends, where they merge into the side portions of the tire near the bead or flange-thereof, their thickened or enlarged ends being adjacent to and terminating at the tread surface of the tire, vthus greatly strengthening the sides of the tire while such thickened ends reinforce the tread surface, such ribs distributing the .stress of lpressure from the thick tread to the thinner sides Vin substantial dproportion to the ta ered portion of the si e walls of the tire, t us obviating any tendency of the shoe or tire to break down, and this without interfering with the fproper resiliency of the different portions o the tire. The ribs or projections are -not only located alternately `with the suction chambers, but alternately relatively to each other at the sides of the tire, as clearly shown in the drawings.

en the chambers .and projections are located as'shown and described; the chambers will more readily adhere to the roadway,

while at the same time'jthe ribs are'so disposed -as to vprovide a substantial brace to the intermediate portions of the tire, and l materially'assist 1n preventing thesame y:3- j l i' 957,167

hicles, having a tread portion provided with a serie of chambers or pockets, the tread portion having at the sides thereof a series of projections terminating at the tread and level therewith, there being'one of the projections on one side of the tire between two compression chambers or pockets, and there being one of the projections on the opposite side of the tire between one` of the before mentioned compression chambers or pockets and the next succeeding compression chamber or pocket, and the sides of the tire opposite to where the projections are Alocatedbeing free of the projections.

In testimony whereof I have signed 'my' name to thissp'eciication in the presence of two subscrlbing witnesses.

IVA BELLE KEMPSHALL Witnesses JNO. IMIRm, j* PAUL B'. BRAoKmT. 

